Compression relief valve



Nov. 30 1926.

Jan

C. C HANSEN COMPRESSION RELIEF VALVE Filed Sept. 16. 1925 1 I 0 1; a 0\ r 1) OR IL -4 I s 2 Z; R n

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' the Tatented Nov. 30, 1926.

onannns c. HANSEN,- or EAs'ro PENNSYLVANIA,

1,608,559 UNITED STATES PATENT orrica.

ASSIGNOR T0 INGERSOLL-RAND COMPANY, JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

COMPRESSION RELIEF VALYE.

Application filed September 16, 1925. Serial No. 56,656.

This invention relates to rock drills, but more ing valves and compression relief valves for fluid actuated rock drills of the hammer type.

The objects of the invention are to produce a compression relief valve of the rocking type which may be actuated by the di rect application of live pressure fluid from supply against the pressure surface formed by one side or the other of. the said valves in order to-throw the valves quickly and with certainty and precision. Other objects of the invention are to produce a light quick operatingvalve which is cheap to manufacture and yet is strong and durable.

The invention is illustrated in one of its preferred forms in the accompanying drawings in which Figure 1 is a longitudinal sectional side elevation partly broken away of so much of a rock drill as will serve to illustrate the invention, taken on the line 1-1 of Figure 2 looking in the direction ofthe arrows,

Figure 2 is a transverse sectional plan view igure 1 on the line 2--2 looking in the direction of the arrows,

' Figure '3 is a View similar to Figure 1 with the piston and ring valve in different positions, and

Figure l is a view similar to Figure 2 with the valves in dii'lferent positions.

Referring to the drawings, the cylinder A.

is provided with a piston B preferably of the and head block hammer type having the -t'orwarcl extension or shank G extending through the front cyl inder washer D to impart blows of impact to the usual drill steel. In this instance, rifle bar rotation is shown including the ride bar E and the rotation ratchet F and rotation head (i, which two latter parts are located within the back head H. A back head plate J covers the rotation rnechanism and in this instance the valve mechanism is shown within the head block K which holds the water tube L and also contains the throttle valve A sleeve P is preferably placed around the water tube and is seated in the plateJ K to seal the interior of the ring valve Q from the remaining parts of the drill, since the ring valve in this instance is shown surrounding thewater tube. A shallow fiat valve cage R as shown is located within the shallow valve chest portion particularly to motive fluid distribut of the head block K and this valve cage contains a cavity S which is generally circular in form, but is preferably not a true circle. This cavity forms the valve chamber for the valve Q, whiclnvalve is preferably of annular shape and forms a true circle.

The cavity or main central bore S of the valve cage is preferably formed by the intersection of two circles of the same diameter so that the opposed portions T and U of the cavity S V and W by flat portions, although these flat portions cannot be clearly indicated in the drawings owing to the scale to which the drawings are made. The two halves T and U of the boundary walls of the cavity S need not necessarily be semi-circular but for the best results, the radius of curvature of each approximate halfT and U should-sub stantially be the same.

The valve cage R is of shallow depth since the valve is intended to be light, thin and flat and is preferably truly circular having the same radius of curvature as that *or" the opposed end portions T and U of the valve chamber so that the valve may reciprocate transversely in said chamber and will fit snugly in each semi-circular portion of the chamber. The valve as shown reciprocates transversely to the longitudinal axis of the bore of the valve cage, which axis as indicated in Figures 2 and 4 does not exactly coincide with the longitudinal axis of the drill cylinder owing to the fact that a compression relief valve X is also located within the head block K at one side of the ring valve Q.

Ports Y and Z in the valve cage are open through the semi-circular walls of the valve chamber and are controlled by the faces of the reciprocating ring valve. The ring valve is comparatively fiat and of substantially greater diameter than width, in this instance the width of the valve being taken as the height of the valve. The thickness of the valve is understood to be the thickness of the walls of the valve and in this instance the valve is shown of exaggerated thickness and substantially rigid, but, if desired, the walls of the valve may be made so thin that the valve is elastic and may be flexed by the that in ight discrepancy bethe curvature of the circular walls of fiuid'pressure passin through it so case there IS any sfl tween are semi-crrcles joined at the points till ill

inside of the valve and through the slots to the outside of the valve and thence through one or the other of the inlet. ports Y or Z, through passages or (Z to one end or the other of the cylinder. When one of the passages 0 or (Z is an inlet passage, the other forms a compression relief passage.

The compression relief valve X 111- the form of a rocking valve is contained in the valve chamber 0 formed in this instance be tween the valve cage R- and the circular wall 7' of the back head K, which contains" the relief ports and h controlled by said valve. The relief chamber 6 is alongside of and in the transverse plane of the main central bore S. Ports j'and 7c connect the ports Y and Z with the compression relief valve chamber 6 and the valve X has an outer convex curved faceo of less radius of curvature than that of the inner concave face f of its valve chamber so that as the valve X rocks. on its pivot p, the relief ports 9 and [2 arecontrolled by the valve. Pivot p forms a substantial closure or seal dividing the valve chest into two chambers and the valve is actuated by live pressure fluid acting through the ports j and is directly upon the inner surface of one side or the other of the relief valve. The pressure surfaces of the valve are measured by the distance from the,

center of the pivot p to the periphery of lthe valve chest.

on its forward stroke.

' In the operation indicated in Figure 1 and is about'to start The main free eihaust g in the cylinder controlled by the pieton is open so'that the pressure is reduced to atmosphere at the left handside of the valve Q as Figure 1 isviewed. Pressure fluid entering the valve through the admission port I) will force the valve to the left as indicated in Figures 1 and 2, closing the inlet port Z and opening the inlet port Y.

I so

r QPiressurefluid is thus admitted to the rear,-

ward end of the cylinder and the piston is driven forward to, the position indicated-in- Figure 3, having overrunthe exhaust port.

q. Compression in the forward end of the cylinder is relieved through thepassa-ge (l and thence through. the port Z and connectingport k-to thereliefvalve chamber e,

and thence to atmosphere through the relief port h, which is'open for this ar ose be cause live pressure fiuidthrought e ports Y d :2 a a h ars-s t i e at "the I of the device let it be as -sumed that the piston B is in the position inner surface of one side or neeaeae sition indicated in Figure 2 closing the relief ort g.

When thepiston B overruns the exhaustport 9, pressure on the right hand side of the valve Q, as Figure 3 is viewed, is reduced to atmosphere and the valve is thrown by live pressure fluid to the position indicated in Figures 3 andxi thus admitting live pressure fluid through the assage (Z to the forward end of the cylind er and at the same time the compression relief valve X is rocked to the position indicated in Figure .4. The piston travels on its rearward stroke and compression in the rearward end of the cylinder is relieved through the compression-relief port 9 after which the cycle is repeated.

1 claim: r

1. In afiuid actuated rock drill, the combination of a cylinder and reciprocating piston, a main piston controlled exhaust for said cylinder, a distributing valve, and

ing compression relief valve pivoted in said 7 chest and having an outer convex valve controlling face of less radius of curvature than the inner concave curved wall of said chest,

and means for rocking said valve by pressure fluid.

bination of a cylinder and reciprocating piston, a main piston controlled exhaust for said cylinder, a distributing valve, and

2. In afluid actuated rock drilLthe com- 7 means for relieving compression in the cylinder comprising a valve chest having a' curvedwall, relief ports in said wall, a rocking compression relief valve pivoted in saidv chest and having an outer convex valve con trolling face of less radius of curvature than the inner concave curved wall of said chest,

and means for rocking said valve by the di- Md rect'pre'ssure of live motive fluid against the the other of said valve.

8. In a fluid actuated rock drill, the combination of a cylinder and reciprocating piston, a main piston controlled exhaust for said cylinder, a distributing valve, and

means for relieving compression in the cylinder comprising a valve chest having a curved wall, relief ports in said wall, a rocking compression relief valve pivoted in said chest and having an outer convex valve controlling face of less radius of curvature "than the inner concave. curved wall of said chest. the. pivot of said valve forming a seal dividing the valve chest into two chambers, and means for rocking said valve by subjecting the'inner surface of one side or the other oft-he valveto the direct pressure of live motive fiuid'admitted to one valve chamber while the other is open to exhaust.

4. In a fluid actuated rock drill, the combination of a cylinder and reciprocating piston, a flat valve chest having a bore formed with opposed semi-circular portions, a flat ring shaped fluid actuated valve in said bore reciprocating in the direction of a diameter of the bore and cooperating with saidsemicircular portions of the valve chest bore for distributing pressure fluid to the ends of the cylinder, .said ring valve having serrated edges for permitting the passage of pressure fluid, and means for supplying pressure fluid to the interior of said valve.

5. In a fluid actuated rock drill, the con1 bination of a cylinder and reciprocating piston, a shallow flat valve chest having a main central bore formed with opposed semi-circular portions, an annular fluid actuated valve in said bore reciprocating transversely to the longitudinal axis of the bore and cooperating with said semi-circular portions of the valve chest bore for, distributing pressure fluid to the ends of the cylinder, said valve chest having a separate relief valve chamber located alongside of and in the transverse plane of the main bore, a flat rocking compression relief valve in said separate valve chamber operatively associated with said annular valve, and live pressure fluid ports connecting said valve chest with the ends of said compression relief valve for actuating said valve.

6. In a fluid actuated rock drill, the combination of a cylinder and reciprocating piston, a shallow flat valve chest having a main central bore formed with opposed curved portions. ports in said curved Wall portions, an annular valve in the valve chest reciprocating between said curved Wall portions and having the same radius of curvature as said wall portions said valve chest having a separate relief valve chamber located alongside of and in the transverse plane of the main bore, a flat rocking compression relief valve associated with said annular valve, and live pressure fluid ports connecting said valve chest with the ends of said compression relief valve for actuating said valve.

In testimony whereof I have signed this specification:

CHARLES C. HANSEN. 

